Machine fob



J. e. sHANDs, oFsT. LoU1s,M1`ssoUR1.

MACHINE ron DRESSING MILLsToNEs.

specification of Letters Patent NQ. 10,674, dated March 21, 1854.

T0 all whom t may concern Be it known that I, J. G. SHANDS, of the city of St. Louisand State of Missouri, have invented a newland useful Implement for Dressing Millstones; and I4 dohereby de- Clare that the following is a full, clear, and exact description of the co-nstruction and operation of the same, reference being had to the accompanying drawings, making a part of this specification, in which.d

Figure 1l is a side view of my implement. Fig. 2 is a plan or top view of the same, showing the manner in which the implement is applied to a mill stone.

Similar letters of reference indicate corresponding parts in the several figures.

This invention relates to a new and useful implement for picking and dressing millV arbor within a swinging frame, by'iwhich a.

greater or less vibration may be given the arbor, and the pick be made to descend upon the stone with the requisite degree of force.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation A represents a rectangular frame, on the upper part of which a carriage P is placed, said carriage fitting on a way (an) onvone side of the frame. s

C is a stock the base of which fits in the carriage B in dovetail form as shown in Fig. 1, a groove or recess (2),) see Fig. 2, being in the upper surface of the carriage in which the stock C slides in a "direction transversely with the frame A. On the front of the stock C, is the pick arbor D, which works in suitable boxes (c) (0'). On

the arbor D, there is a iXed circular ledge or collar (d) between which and the upper boX (c) there is a spiral spring (e), said spring encompassing the arbor. See Fig. 1.

Around the arbor D, and above t-he upper` boX (0') there is another spiral spring (f), see Fig. l, the upper part of which bears against a nut (g) on the upper part of the arbor on which for a short distance a screw thread is cut.

D', is the pick secured to the lower end of the arbor. See dotted lines, Fig. 1.

E, is a swinging frame of V shape havingl a hub or boss (h) at each side through which a shaft F runs, said shaft fitting in bearings (i) (z') at the ends of arms (j) (j) stock'C, as shown in Fig. 2.

, Gr, is a shaft at the front of the swinging framehaving upon it the wiperwheel H and two toothedwheels I, I, one on each yside of the wiper wheel. These wheels I, I, gear into two toothed wheels J, J, on the shaft F. y

L, is a crank at'one end of the shaft"F,.1 M, see dotted lines, Fig. 1, Ais a shafty placed in the carriage B, and having a pin- WhCh project outward at each side of the ion on its inner end which gears into a i rack (l) on the under side of the base of the stock. On the outer end of ythe vshaft M there is a ratchet wheel N, into which a pawl (m) catches, said pawl being `attached by a pivot (71,)to an upright lever O;

P, is a ring 'or collar attached by apivot (p) tothe front part of the frame A.

R, is a pawl at the back of the swinging frame, .said pawl catching into the teeth of a rack S, on the back of the stock C. y

Operation: The implementis placed upon the' stone T, tobe picked or dressed, and the ringo-rcollar is placed over the spindle U, atv the center of the stone, so that the frame A willbe in line or parallel wit-h a section of furrows (1'), see4 Fig. 2, inV which the spindle, section o-f a stone, and furrowsare shown in-red. The crank L, is then turned, and thevwipe'r wheel II, as it rotates strikes the liXed ledge or collar (d) on the arbor D, and raises the arbor, which, when the ledge or collar is freed from the wiper wheel, is forceddown by the spiral spring (e). The length of the vibrationsl of the arbor D, may be made greater or less by adjusting the vframe E. For instance, if the front end of t-he frame is depressed the wiperwheelwi'll not act so much upon the ledge or collar (ci) as when the frame is in a horizontal position. The greater the length o-f the vibration the more the spring (e) will be compressed when the arbor is raised and consequently the arbor will descend with proportionally greater force, the pick D, acting upon the stone T. The swinging frame is retained in the desired position by the pawl R and the rack S. To pick or sharpen the furrows (7') the carriage B is 'gradually moved back and forth upon the frame A, the pick being directly over the furrows operated upon, the pick traversing the width of the furrow by `sliding the stock Cv in the groove (b) in the carriage by means of the vor.

lever O, ratchet N, shaft M, and pinion 7c, which gears into' the rack (Z) on the under side of the base of the stock, the lever O being operated by the iinger.

In dressing mill stones the force of the blow of the pick requiresto be graduated very nicely. If this isnot attended to, soft places in the stone will be scored or hollowed out, leaving an uneven surface. yBy adjusting or screwing down the nut (9,) on the upper part of the arbor D, the force of t-he spring (e) underneath the box (0') will be counteracted in a measure, by the spring (f,) on the arbor above the box (0'). The

Whole surface of the stone may be `dressed by turning the frame around on the stone, the collar or ring P being upon the 4spindle U.

By the within described implement mill stones may be dressed or picked in a perfect manner and inia much shorter time than they can be dressed or picked by'hand. It is a labor saving machine, and by its use an experienced or skilful hand is not neces-v Witnesses:

S. H. WALES, JN0. W. HAMILTON. 

